A power converting circuit includes a converter. The converter receives and converts an input power to provide power for a load. The converter includes a power storage unit, a switch unit, a capacitor unit, and a current sampling unit. The power storage unit includes input and output terminals. The switch unit includes first and second switches, which are series connected at a common terminal, and the common terminal is coupled to the output terminal of the power storage unit. The capacitor unit includes first and second capacitors. The first capacitor and the switch unit are parallel connected to form a capacitor-switch parallel structure. The second capacitor capacitance is more than ten times larger than the first capacitor capacitance. The current sampling unit and the capacitor-switch parallel structure are series connected to form a capacitor-sampling unit series structure. The capacitor-sampling unit series structure and the second capacitor are parallel connected.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A power converter, comprising a converter, wherein the converter is configured to receive and convert an input power for providing power to a load, and the converter comprises: a power storage unit comprising: an input; and an output; a first switch unit comprising: a first switch; and a second switch connected in series with the first switch at a first common terminal, wherein the first common terminal is coupled to the output of the power storage unit; a first capacitor unit comprising: a first capacitor connected in parallel with the first switch unit to form a first capacitor-switch parallel structure; and a second capacitor, wherein the capacitance of the second capacitor is more than ten times larger than the capacitance of the first capacitor; and a first current sampling unit connected in series with the first capacitor-switch parallel structure to form a first capacitor-sampling unit series structure, wherein the first capacitor-sampling unit series structure and the second capacitor are connected in parallel, wherein the first current sampling unit is configured to detect at least one of the current of the first switch and the current of the second switch.
2. The power converter of claim 1 , wherein the first capacitor-switch parallel structure comprises a first terminal and a second terminal, wherein the second capacitor comprises a first terminal and a second terminal; wherein the first current sampling unit comprises: a first current sampling element coupled between the first terminal of the first capacitor-switch parallel structure and the first terminal of the second capacitor; and a second current sampling element coupled between the second terminal of the first capacitor-switch parallel structure and the second terminal of the second capacitor.
3. The power converter of claim 1 , wherein the output of the power storage unit comprises: a first connector coupled to the first common terminal; and a second connector coupled to the second capacitor.
4. The power converter of claim 1 , wherein the first capacitor is selected from the group consisting of a film capacitor and a ceramic capacitor.
5. The power converter of claim 1 , wherein the second capacitor comprises an electrolytic capacitor.
6. The power converter of claim 1 , wherein the first current sampling unit is selected from the group consisting of a current transformer and a sampling resistor.
7. The power converter of claim 1 , further comprising: a second switch unit comprising: a third switch coupled to the second capacitor; and a fourth switch connected in series with the third switch at a second common terminal, and coupled to the second capacitor, wherein the second common terminal is coupled to the output of the power storage unit.
8. The power converter of claim 7 , wherein each of the first switch to the fourth switch is selected from the group consisting of a diode, a metal-oxide-semiconductor field-effect transistor (MOSFET) and an insulated gate bipolar transistor (IGBT).
9. The power converter of claim 7 , wherein the output of the power storage unit comprises: a first connector coupled to the first common terminal; and a second connector coupled to the second common terminal.
10. The power converter of claim 7 , further comprising: a second capacitor unit comprising: a third capacitor connected in parallel with the second switch unit to form a second capacitor-switch parallel structure; and a fourth capacitor, wherein the capacitance of the fourth capacitor is at least more than ten times larger than the capacitance of the third capacitor; and a second current sampling unit connected in series with the second capacitor-switch parallel structure to form a second capacitor-sampling unit series structure, wherein the second capacitor-sampling unit series structure and the fourth capacitor are connected in parallel, wherein the second current sampling unit is configured to detect at least one of the current of the third switch and the current of the fourth switch.
11. The power converter of claim 10 , wherein each of the first capacitor and the third capacitor is selected from the group consisting of a film capacitor and a ceramic capacitor.
12. The power converter of claim 10 , wherein each of the second capacitor and the fourth capacitor comprises an electrolytic capacitor.
13. The power converter of claim 10 , wherein the second capacitor-switch parallel structure comprises a first terminal and a second terminal, wherein the fourth capacitor comprises a first terminal and a second terminal; wherein the second current sampling unit comprises: a third current sampling unit coupled between the first terminal of the second capacitor-switch parallel structure and the first terminal of the fourth capacitor; and a fourth current sampling unit coupled between the second terminal of the second capacitor-switch parallel structure and the second terminal of the fourth capacitor.
14. The power converter of claim 13 , wherein each of the first current sampling element to the fourth current sampling element is selected from the group consisting of a current transformer and a sampling resistor.
15. The power converter of claim 1 , wherein the first current sampling unit comprises a current sampling element, and the current sampling element is coupled between the second terminal of the first capacitor-switch parallel structure and the second terminal of the second capacitor, wherein the input of the power storage unit is configured to receive the input power, and the second capacitor is coupled to the load.
16. The power converter of claim 1 , wherein the first current sampling unit comprises a current sampling element, and the current sampling element is coupled between the first terminal of the first capacitor-switch parallel structure and the first terminal of the second capacitor, wherein the input of the power storage unit is coupled to the load, and the second capacitor is configured to receive the input power.
17. The power converter of claim 1 , wherein the converter is selected from the group consisting of a half-bridge circuit, a totem-pole circuit, a full-bridge circuit, a T-type three-level converter and a I-type three-level converter.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
July 7, 2015
February 21, 2017
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